Bump mypy from 1.8.0 to 1.9.0 (#330)

Author: dependabot[bot]

setup.cfg

@@ -47,7 +47,7 @@ package_dir =
 [options.extras_require]
 dev =
     bump2version==1.0.1
-    mypy==1.8.0
+    mypy==1.9.0
     parameterized==0.9.0
     pre-commit==3.5.0; python_version < "3.9"
     pre-commit==3.7.0; python_version >= "3.9"